一、布置自学任务师:(手指翻开的书页)我们今天学的内容就是这些,叫什么?生:负数。师:听说过吗?生:听说过。师:给你们十分钟,先看材料说明,再尝试着解决问题,会做的题都做上,然后在小组里讨论,把自己不明白的问题提出来,小组还解决不了的就写到黑板上,只写不明白的或自己疑惑的地方!好,开始! First, the arrangement of self-learning task division: (open your fingers page) What we learn today is what, what is the name? Health: negative. Teacher: Have you heard of it? Teacher: Give you ten minutes, first look at the material description, and then try to solve the problem, do the questions are done, and then in the group to discuss, do not understand their own problems raised, the group can not solve the write to the blackboard On the write-only do not understand or their own puzzled place! Well, the beginning!